Creating a Pricing/Sales Form

Creating a Pricing/Sales Form

How can I create a simple pricing form using drop down menus to generate a total once items are selected? I'm not looking to create a invoice form, but more like something a sales agent can use to generate totals for a product efficiently?

Here is an example:

Products:
      - Test A
      - Test B
      - Test C
            User selected "Test B"

Quantity:
      - 1
      - 2
      - 3
            User selected "3"

Shipping Method:
      - Ground
      - Overnight
            User selected "ground"

                                    Total: $20.00